University of California, Berkeley Department of Mechanical Engineering. ME 290R Topics in Manufacturing, Fall 2014: Lithography
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1 University of California, Berkeley Department of Mechanical Engineering ME 290R Topics in Manufacturing, Fall 2014: Lithography Class meetings: TuTh pm in 1165 Etcheverry Tentative class schedule (last updated September 18) Class Papers that will be 1 Th August 28 Introduction to ME290R. Overview of current and emerging lithography technologies and challenges. Future lithography requirements (with reference to the International Technology Roadmap for Semiconductors). Requirements for integration of lithography with other process steps. 2 Tu September 2 Performance metrics for lithography techniques (ways to evaluate a lithography process). Resolution; line edge roughness; overlay capability; throughput; cost of ownership; capital cost; energy consumption and environmental impact (e.g. solvent usage; material wastage); pattern dependencies. 3 Th September 4 Nanoimprint lithography (NIL), part 1: process physics. Contact mechanics of stamp-wafer interactions. Resist deformation models. Sources of defects. 4 Tu September 9 Nanoimprint lithography, part 2: imprintable materials. Thermal vs UV-curing resist materials. Temperature-viscosity relationships of thermoplastic resists. Shear thinning. Photocrosslinking and thermal crosslinking reactions. Oxygen inhibition. Use of surfactants and release layers. Reading 1: NIL capabilities and challenges Reading 1 1 of 4
2 5 Th September 11 Nanoimprint lithography, part 3: stamp fabrication technologies. Materials (quartz, silicon, metallic, polymeric). Intermediate stamp replication strategies. Pattern-writing processes (e-beam, directed self-assembly). Seamless rollers for roller-based patterning. Defect inspection approaches. 6 Tu September 16 Introduction to simulation assignment. Demonstration of NIL simulation software. Example: investigation of nanoimprintfriendly dummy fill. Presentation of task. Q&A. 7 Th September 18 Nanoimprint lithography, part 4: machine design. Step-andflash vs whole-wafer patterning. Roll-to-roll and roll-to-plate configurations. Resist dispensing methods: droplet, spin-on, doctor blade. Load application: flexure; stamp-bowing mechanism; air cushion press. Managing defect sources. 8 Tu September 23 Nanoimprint lithography, part 5: applications. Photonic crystal LEDs. Dual damascene dielectric imprinting. Bitpatterned data storage. Flash memory. Novel memory structures (e.g. by topolithography ). Surface nanoengineering (e.g. superhydrophobicity; printing color using plasmonics). 9 Th September 25 Nanoimprint lithography, part 6: stamp compliance optimization and large-area patterning. Segmented, layered, and monolithic stamps. Micro-gravure. Self-Aligned Imprint Lithography. 10 Tu September 30 Guest lecture: Prof. Vivek Subramanian, Berkeley EECS. Microgravure 11 Th October 2 Microcontact printing. Ink transfer processes. Design of stamps and sources of defects collapse, buckling, etc. Metal film peel-off patterning via rate-dependent adhesion. Application example, e.g. printing transparent conductive patterns. 2 of 4 Papers that will be Reading 2: NIL defectivity, throughput and stamp lifetime considerations Reading 3: NIL applications (bitpatterned media; Flash memory) Reading 2 Reading 3 Simulation assignment preparatory questions
3 Paper(s) that will be 12 Tu October 7 Lithography for MEMS and microfluidics. LIGA (very highaspect-ratio patterning); hot embossing; soft lithography. Examples in microfluidics manufacturing. 13 Th October 9 Photolithography. Factors determining resolution (numerical aperture, k, wavelength). Illumination technology. Alignment methods (fiducial, moiré). Resist technology (positive, negative, image reversal, contrast concepts). Resolutionenhancing innovations. Double- and triple-patterning. Coloring algorithms. Line cutting. Immersion lithography. Source-mask optimization. Phase masks. Computational lithography (optical proximity correction). Expressions of interest in pitching project ideas on 10/16 also by 14 Tu October 14 Project idea pitches and team networking Simulation assignment. 15 Th October 16 Extreme ultraviolet lithography. Issues: source power, mask infrastructure, economics. 16 Tu October 21 Scanning-beam lithographic methods. Electron-beam lithography: resolution-limiting factors. Salty development. Grayscale and reflow techniques. Proximity correction. Ion and proton beam techniques. Reading 4: Photolithography/EUV innovations Reading 4 17 Th October 23 Quiz. 75 minutes, open book/notes. Reading 5 response and project teams compositions (3 5 people per team) by 3 of 4
4 Paper(s) that will be 18 Tu October 28 Directed self-assembly. Block copolymers. Scalable approaches. DNA-based self-assembly. 19 Th October 30 X-ray/zone-plate array lithography; near-field methods 20 Tu November 4 Guest lecture/visit 21 Th November 6 Interim project presentations Tu November 11 No class: Veterans Day 22 Th November 13 Guest lecture: Christoph Peroz, Director of Nanofabrication and Optical Devices, Abeam Inc., based at the LBNL Molecular Foundry. 23 Tu November 18 Panel discussion: The Future of Lithography. 24 Th November 20 Emerging/specialist lithography techniques. Interference lithography. Nanoskiving. Edge-based lithography. 3D lithography techniques (stereolithography, including two-photon processes; holographic lithography). 25 Tu November 25 Project presentations, part 1 (approx. 4 groups, each with 12 minutes presentation plus 5 minutes Q&A and 3 minutes changeover time) Th November 27 No class: Thanksgiving 26 Tu December 2 Project presentations, part 2 (another ~4 groups) 27 Th December 4 Project presentations, part 3 (another ~4 groups) Reading 5: multiple e- beam and directed selfassembly Final project reports via bcourses by Friday December 12 at 5pm For literature readings 1 5, written responses will be required to one paper per set of readings. The papers will be available on bcourses at least one week before the response is. The papers will be briefly introduced in class one week before the 4 of 4
5 date (e.g. for Reading 1, whose response is on September 4, the papers will be introduced on August 28). During the inclass introduction, some potential points for discussion will be raised. 5 of 4
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